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<meta property="og:description" content="方法引用方法引用(Method References)  当要传递给Lambda体的操作，已经有实现的方法了，可以使用方法引用!  方法引用可以看做是Lambda表达式深层次的表达。换句话说，方法引用就 是Lambda表达式，也就是函数式接口的一个实例，通过方法的名字来指向一个方法，可以认为是Lambda表达式的一个语法糖。  要求:实现接口的抽象方法的参数列表和返回值类型，必须与方法引用的方法的">
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</head><body><div id="web_bg"></div><div id="sidebar"><div id="menu-mask"></div><div id="sidebar-menus"><div class="author-avatar"><img class="avatar-img" data-lazy-src="https://qiniu.codekylin.cn/img/20200807181526.jpg" onerror="onerror=null;src='https://qiniu.codekylin.cn/github/img/friend_404.gif'" alt="avatar"/></div><div class="site-data"><div class="data-item is-center"><div class="data-item-link"><a href="/archives/"><div class="headline">文章</div><div class="length-num">362</div></a></div></div><div class="data-item is-center"><div class="data-item-link"><a href="/tags/"><div class="headline">标签</div><div class="length-num">427</div></a></div></div><div class="data-item is-center"><div class="data-item-link"><a href="/categories/"><div class="headline">分类</div><div class="length-num">101</div></a></div></div></div><hr/><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fa fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fa fa-archive"></i><span> 时间轴</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fa fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/categories/"><i class="fa-fw fa fa-folder-open"></i><span> 分类</span></a></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fa fa-link"></i><span> 友链</span></a></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw fa fa-heart"></i><span> 关于</span></a></div></div></div></div><div class="post" id="body-wrap"><header class="post-bg" id="page-header" style="background-image: url('https://qiniu.codekylin.cn/github/img/img/wallhaven-j5j6r5.png')"><nav id="nav"><span id="blog_name"><a id="site-name" href="/">Kylin</a></span><div id="menus"><div id="search-button"><a class="site-page social-icon search"><i class="fas fa-search fa-fw"></i><span> 搜索</span></a></div><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fa fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fa fa-archive"></i><span> 时间轴</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fa fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/categories/"><i class="fa-fw fa fa-folder-open"></i><span> 分类</span></a></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fa fa-link"></i><span> 友链</span></a></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw fa fa-heart"></i><span> 关于</span></a></div></div><div id="toggle-menu"><a class="site-page"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="post-info"><h1 class="post-title">Java之方法引用</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2020-12-21T12:44:09.000Z" title="发表于 2020-12-21 20:44:09">2020-12-21</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2022-07-12T11:42:50.035Z" title="更新于 2022-07-12 19:42:50">2022-07-12</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/Java/">Java</a><i class="fas fa-angle-right post-meta-separator"></i><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/Java/Java8/">Java8</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">1.1k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>5分钟</span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h2 id="方法引用"><a href="#方法引用" class="headerlink" title="方法引用"></a>方法引用</h2><p>方法引用(Method References)</p>
<ul>
<li><p>当要传递给Lambda体的操作，已经有实现的方法了，可以使用方法引用!</p>
</li>
<li><p><strong>方法引用可以看做是Lambda表达式深层次的表达。换句话说，方法引用就 是Lambda表达式，也就是函数式接口的一个实例，通过方法的名字来指向一个方法，可以认为是Lambda表达式的一个语法糖。</strong></p>
</li>
<li><p><mark>要求:实现接口的抽象方法的参数列表和返回值类型，必须与方法引用的方法的参数列表和返回值类型保持一致（参数个数不要求）!</mark></p>
</li>
<li><p>格式:使用操作符 “<code>::</code>” 将类(或对象) 与 方法名分隔开来。</p>
</li>
</ul>
<p>如下三种主要使用情况:</p>
<ul>
<li>对象::实例方法名 </li>
<li>类::静态方法名 </li>
<li>类::实例方法名</li>
</ul>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/image-20201221204840019.png" alt="image-20201221204840019"></p>
<p>方法引用使用的要求：要求接口中的抽象方法的形参列表和返回值类型与方法引用的方法的形参列表和返回值类型相同！（针对于情况1和情况2）</p>
<h2 id="对象-实例方法名"><a href="#对象-实例方法名" class="headerlink" title="对象::实例方法名"></a>对象::实例方法名</h2><p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/image-20201221205756019.png" alt="image-20201221205756019"></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//1.对象::实例方法</span></span><br><span class="line"><span class="comment">//Consumer中的void accept(T t)</span></span><br><span class="line"><span class="comment">//PrintStream中的void println(Object x)</span></span><br><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">test1</span><span class="params">()</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    Consumer&lt;String&gt; consumer = <span class="keyword">new</span> Consumer&lt;String&gt;() &#123;</span><br><span class="line">        <span class="meta">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">accept</span><span class="params">(String str)</span> </span>&#123;</span><br><span class="line">            System.out.println(str);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;;</span><br><span class="line">    consumer.accept(<span class="string">&quot;世界&quot;</span>);</span><br><span class="line"></span><br><span class="line">    <span class="comment">//lambda简写</span></span><br><span class="line">    Consumer con1 = str -&gt; System.out.println(str);</span><br><span class="line">    con1.accept(<span class="string">&quot;你好&quot;</span>);</span><br><span class="line"></span><br><span class="line">    <span class="comment">//方法引用使用PrintStream中的void println(T t)</span></span><br><span class="line">    PrintStream printStream = System.out;</span><br><span class="line">    Consumer tConsumer1 = printStream::println;</span><br><span class="line">    tConsumer1.accept(<span class="string">&quot;世界你好&quot;</span>);</span><br><span class="line"></span><br><span class="line">    Consumer tConsumer = System.out::print;</span><br><span class="line">    tConsumer.accept(<span class="string">&quot;你好世界&quot;</span>);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/image-20201221205845296.png" alt="image-20201221205845296"></p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/image-20201221210058044.png" alt="image-20201221210058044"></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//Supplier中的T get()</span></span><br><span class="line"><span class="comment">//Employee中的String getName()</span></span><br><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">test2</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    Employee common = <span class="keyword">new</span> Employee(<span class="number">10000</span>, <span class="string">&quot;common&quot;</span>, <span class="number">1</span>, <span class="number">0</span>);</span><br><span class="line">    Supplier&lt;String&gt; s1 = <span class="keyword">new</span> Supplier&lt;String&gt;() &#123;</span><br><span class="line">        <span class="meta">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> String <span class="title">get</span><span class="params">()</span> </span>&#123;</span><br><span class="line">            <span class="keyword">return</span> common.getName();</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;;</span><br><span class="line">    System.out.println(s1.get());</span><br><span class="line"></span><br><span class="line">    <span class="comment">//lambda表达式</span></span><br><span class="line">    Employee kylin = <span class="keyword">new</span> Employee(<span class="number">10001</span>, <span class="string">&quot;kylin&quot;</span>, <span class="number">11</span>, <span class="number">1111</span>);</span><br><span class="line">    Supplier&lt;String&gt; s2 = () -&gt; kylin.getName();</span><br><span class="line">    System.out.println(s2.get());</span><br><span class="line"></span><br><span class="line">    <span class="comment">//方法引用</span></span><br><span class="line">    Employee mr = <span class="keyword">new</span> Employee(<span class="number">10001</span>, <span class="string">&quot;MethodRef&quot;</span>, <span class="number">7</span>, <span class="number">9999</span>);</span><br><span class="line">    Supplier&lt;String&gt; s3 = mr::getName;</span><br><span class="line">    System.out.println(s3.get());</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="类-静态方法"><a href="#类-静态方法" class="headerlink" title="类::静态方法"></a>类::静态方法</h2><p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/image-20201223151226056.png" alt="image-20201223151226056"></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//2.类::静态方法</span></span><br><span class="line"><span class="comment">//Comparator中的int compare(T t1,T t2)</span></span><br><span class="line"><span class="comment">//Integer中的int compare(T t1,T t2)</span></span><br><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">test3</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    <span class="comment">//普通</span></span><br><span class="line">    Comparator&lt;Integer&gt; c1 = <span class="keyword">new</span> Comparator&lt;Integer&gt;() &#123;</span><br><span class="line">        <span class="meta">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">compare</span><span class="params">(Integer t1, Integer t2)</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">            <span class="keyword">return</span> Integer.compare(t1, t2);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;;</span><br><span class="line">    System.out.println(c1.compare(<span class="number">12</span>, <span class="number">21</span>));</span><br><span class="line"></span><br><span class="line">    <span class="comment">//lambda</span></span><br><span class="line">    Comparator&lt;Integer&gt; c2 = (t1, t2) -&gt; Integer.compare(t1, t2);</span><br><span class="line">    System.out.println(c2.compare(<span class="number">12</span>, <span class="number">21</span>));</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="comment">//方法引用，参数一样省略</span></span><br><span class="line">    Comparator&lt;Integer&gt; c3 = Integer::compare;</span><br><span class="line">    System.out.println(c3.compare(<span class="number">12</span>, <span class="number">21</span>));</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/image-20201223151315803.png" alt="image-20201223151315803"></p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/image-20201223151553187.png" alt="image-20201223151553187"></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//Function中的R apply(T t)</span></span><br><span class="line"><span class="comment">//Math中的Long round(Double d)</span></span><br><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">test4</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    <span class="comment">//普通</span></span><br><span class="line">    Function&lt;Double, Long&gt; function1 = <span class="keyword">new</span> Function&lt;Double, Long&gt;() &#123;</span><br><span class="line"></span><br><span class="line">        <span class="meta">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> Long <span class="title">apply</span><span class="params">(Double d)</span> </span>&#123;</span><br><span class="line">            <span class="keyword">return</span> Math.round(d);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;;</span><br><span class="line">    System.out.println(function1.apply(<span class="number">5.3</span>));</span><br><span class="line"></span><br><span class="line">    <span class="comment">//lambda</span></span><br><span class="line">    Function&lt;Double, Long&gt; function2 = (d) -&gt; Math.round(d);</span><br><span class="line">    System.out.println(function2.apply(<span class="number">5.4</span>));</span><br><span class="line"></span><br><span class="line">    <span class="comment">//方法引用</span></span><br><span class="line">    Function&lt;Double, Long&gt; function3 = Math::round;</span><br><span class="line">    System.out.println(function3.apply(<span class="number">5.5</span>));</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/image-20201223152157288.png" alt="image-20201223152157288"></p>
<h2 id="类-实例方法"><a href="#类-实例方法" class="headerlink" title="类::实例方法"></a>类::实例方法</h2><p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/image-20201223152128818.png" alt="image-20201223152128818"></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//3.类::实例方法</span></span><br><span class="line"><span class="comment">//Comparator中的int compare(T t1,T t2)</span></span><br><span class="line"><span class="comment">//String中的int compareTo(String s)----&gt;t1.compareTo(t2)</span></span><br><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">test5</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    <span class="comment">//普通方法</span></span><br><span class="line">    Comparator&lt;String&gt; c1 = <span class="keyword">new</span> Comparator&lt;String&gt;() &#123;</span><br><span class="line">        <span class="meta">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">compare</span><span class="params">(String s1, String s2)</span> </span>&#123;</span><br><span class="line">            <span class="keyword">return</span> s1.compareTo(s2);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;;</span><br><span class="line"></span><br><span class="line">    System.out.println(c1.compare(<span class="string">&quot;1&quot;</span>, <span class="string">&quot;4&quot;</span>));</span><br><span class="line">    <span class="comment">//lambda</span></span><br><span class="line">    Comparator&lt;String&gt; c2 = (s1, s2) -&gt; s1.compareTo(s2);</span><br><span class="line">    System.out.println(c2.compare(<span class="string">&quot;3&quot;</span>, <span class="string">&quot;7&quot;</span>));</span><br><span class="line"></span><br><span class="line">    <span class="comment">//方法引用</span></span><br><span class="line">    Comparator&lt;String&gt; c3 = String::compareTo;</span><br><span class="line">    System.out.println(c3.compare(<span class="string">&quot;9&quot;</span>, <span class="string">&quot;1&quot;</span>));</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/image-20201223152224451.png" alt="image-20201223152224451"></p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/image-20201223152707844.png" alt="image-20201223152707844"></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//BiPredicate中的boolean test(T t1,T t2);</span></span><br><span class="line"><span class="comment">//String中的boolean equals(O o)----&gt;t1.equals(t2)</span></span><br><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">test6</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    <span class="comment">//普通方法</span></span><br><span class="line">    BiPredicate&lt;String, String&gt; b1 = <span class="keyword">new</span> BiPredicate&lt;String, String&gt;() &#123;</span><br><span class="line">        <span class="meta">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">test</span><span class="params">(String s1, String s2)</span> </span>&#123;</span><br><span class="line">            <span class="keyword">return</span> s1.equals(s2);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;;</span><br><span class="line">    System.out.println(b1.test(<span class="string">&quot;a&quot;</span>, <span class="string">&quot;a&quot;</span>));</span><br><span class="line"></span><br><span class="line">    <span class="comment">//lambda</span></span><br><span class="line">    BiPredicate&lt;String, String&gt; b2 = (s1, s2) -&gt; s1.equals(s2);</span><br><span class="line">    System.out.println(b2.test(<span class="string">&quot;c&quot;</span>, <span class="string">&quot;a&quot;</span>));</span><br><span class="line"></span><br><span class="line">    <span class="comment">//方法引用</span></span><br><span class="line">    BiPredicate&lt;String, String&gt; b3 = String::equals;</span><br><span class="line">    System.out.println(b3.test(<span class="string">&quot;e&quot;</span>, <span class="string">&quot;e&quot;</span>));</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/image-20201223152730198.png" alt="image-20201223152730198"></p>
<h2 id="结论"><a href="#结论" class="headerlink" title="结论"></a>结论</h2><p>其中就是方法引用可以看做是Lambda表达式深层次的表达。使用方法引用必须保证该方法能和某一个对应的函数接口的方法返回值，参数类型保持一致。如果参数个数不一样例如</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//Function中的R apply(T t)</span></span><br><span class="line"><span class="comment">//Employee中的String getName();---&gt;t.getName();</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//BiPredicate中的boolean test(T t1,T t2);</span></span><br><span class="line"><span class="comment">//String中的boolean equals(O o)----&gt;t1.equals(t2)</span></span><br></pre></td></tr></table></figure>

<p>如果想不到使用方法引用，则可以退而求其次使用lambda表达式，或者使用最普通的方式。这只是一种语法而已。只要求能看懂如果有相关源码中使用该语法能知晓真实意图做了啥即可。</p>
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="mailto:undefined">Kylin</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://www.codekylin.cn/27952.html">https://www.codekylin.cn/27952.html</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://www.codekylin.cn" target="_blank">Kylin</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="/tags/Java/">Java</a><a class="post-meta__tags" href="/tags/Java8/">Java8</a></div><div class="post_share"><div class="social-share" 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